The evaporative air cooler is to cool down the workshop through the evaporation of water. The following is a brief step of its working principle:
1. The supply of water: evaporative air cooler is usually equipped with a water tank or water supply pipe, and the water is supplied to the system through the pump.
2. Wet curtain or evaporation medium: The water is imported into the wet curtain or other evaporation medium. Wet curtains are usually made of strong water absorption, such as honeycomb paper or fiber board.
3. Fan operation: Fan starts, sucks the external air into the side of the evaporation medium.
4. Wet air: When the external air is in contact with the water on the surface of the wet curtain through the wet curtain, the water molecules change from liquid to gaseous, absorbing heat, and reduce the air temperature.

5. Wet air discharge: The wet air is discharged from the other side to enter the workshop to achieve ventilation and cooling effect.
In this process, the hot air evaporates the water through contact with the wet curtain, which cools down the air, and at the same time, the humidity will increase. This method is suitable for a relatively dry environment, because in a humid environment, the speed of water evaporation is slow, and the cooling effect may be weakened.
The advantage of evaporating the ventilation and cooling of the workshop lies in its simple working principle, low energy consumption, low maintenance costs, and suitable cooling needs for a certain range. However, it should be noted that its cooling effect may be affected by environmental humidity and temperature.